Can't do accurate weight painting with Blender
The solution is Blender v2.78 

Weight Paint bug fix for v2.78: Blur now smooths between connected weights

Previously it would average all the points under the brush and applying that value, giving an off a feedback loop that often depended on the direction of the brush stroke, giving a not-very-useful smearing effect. Now blend brush smooths between connected edges as it should.

Now there is a real smooth brush that was greatly needed. Now I can do all the weight painting in Blender, also I discovered Alt+B to make a square slice to isolate part of a shape to have an unobstructed view of where you need to edit.